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参数资料
型号： ST72F324LJ2T5
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP44
封装： 10 X 10 MM, TQFP-44
文件页数： 39/154页
文件大小： 3519K
代理商： ST72F324LJ2T5
ST72324Lxx
133/154
ADC CHARACTERISTICS (Cont’d)
Figure 80. Typical A/D Converter Application
12.12.1 Analog Power Supply and Reference
Pins
Depending on the MCU pin count, the package
may feature separate VAREF and VSSA analog
power supply pins. These pins supply power to the
A/D converter cell and function as the high and low
reference voltages for the conversion. In some
packages, VAREF and VSSA pins are not available
(refer to Section 2 on page 7). In this case the an-
alog supply and reference pads are internally
bonded to the VDD and VSS pins.
Separation of the digital and analog power pins al-
low board designers to improve A/D performance.
Conversion accuracy can be impacted by voltage
drops and noise in the event of heavily loaded or
badly decoupled power supply lines (see Section
12.12.2 General PCB Design Guidelines).
12.12.2 General PCB Design Guidelines
To obtain best results, some general design and
layout rules should be followed when designing
the application PCB to shield the noise-sensitive,
analog physical interface from noise-generating
CMOS logic signals.
– Use separate digital and analog planes. The an-
alog ground plane should be connected to the
digital ground plane via a single point on the
PCB.
– Filter power to the analog power planes. It is rec-
ommended to connect capacitors, with good high
frequency characteristics, between the power
and ground lines, placing 0.1F and optionally, if
needed 10pF capacitors as close as possible to
the ST7 power supply pins and a 1 to 10F ca-
pacitor close to the power source (see Figure
81).
– The analog and digital power supplies should be
connected in a star nework. Do not use a resis-
tor, as VAREF is used as a reference voltage by
the A/D converter and any resistance would
cause a voltage drop and a loss of accuracy.
– Properly place components and route the signal
traces on the PCB to shield the analog inputs.
Analog signals paths should run over the analog
ground plane and be as short as possible. Isolate
analog signals from digital signals that may
switch while the analog inputs are being sampled
by the A/D converter. Do not toggle digital out-
puts on the same I/O port as the A/D input being
converted.
AINx
ST72XXX
VDD
IL
±1
A
VT
0.6V
VT
0.6V
CADC
12pF
VAIN
RAIN
10-Bit A/D
Conversion
2k
(max)
CAIN
1
相关PDF资料
PDF描述
ST72324BLJ4B5/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32
ST72324BLJ4B6/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32
ST72324BLJ4T1/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44
ST72324BLJ4T5/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44
ST72324BLJ4T6/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44
相关代理商/技术参数
参数描述
ST72F324LJ2T5E 制造商:STMicroelectronics 功能描述:3 VOLT LEADFREE - Trays
ST72F324LJ2T5TR 功能描述:8位微控制器 -MCU 3V Range 8B MCU RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ST72F324LJ2T6 功能描述:8位微控制器 -MCU ST72F324L ST72324BL 3V RANGE 8B MCU RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ST72F324LJ4T6 功能描述:8位微控制器 -MCU ST72F324L ST72324BL 3V RANGE 8B MCU RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ST72F324LJ4T6TR 功能描述:8位微控制器 -MCU 3V Range 8B MCU RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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